參數(shù)資料
型號： MC705JJ7CDWE
廠商： Freescale Semiconductor
文件頁數(shù)： 146/164頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 224B RAM 20-SOIC
標(biāo)準(zhǔn)包裝： 38
系列： HC05
核心處理器： HC05
芯體尺寸： 8-位
速度： 2.1MHz
連通性： SIO
外圍設(shè)備： POR，溫度傳感器，WDT
輸入/輸出數(shù)： 14
程序存儲器容量： 6KB（6K x 8）
程序存儲器類型： OTP
RAM 容量： 224 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
Analog Subsystem
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
82
Freescale Semiconductor
these bits and the ISEN bit are cleared when the device is reset, the MC68HC705JJ7/MC68HC705JP7
starts with the charge and discharge function disabled.
The length of time required to reach the maximum voltage to be measured and the speed of the time
counting mechanism will determine the resolution of the reading. The time to ramp the external capacitor
voltage to match the maximum voltage is dependent on:
Charging current to external capacitor
Value of the external capacitor
Clock rate for timing function
Any prescaling of the clock to the timing function
Desired resolution
The charging behavior is described by the general equation:
tCHG = CEXT x VX / ICHG
Where:
tCHG= Charge time (seconds)
CEXT= Capacitance (F)
VX= Unknown voltage (volts)
ICHG= Charge current (A)
Since the MCU can measure time in a variety of ways, the resolution of the conversion will depend on the
length of the time keeping function and its prescaling to the oscillator frequency (fOSC). Therefore, the
charge time also equals:
tCHG = P x N / fOSC
Where:
P= Prescaler value (
÷ 2, ÷ 4, ÷ 8, etc.)
N= Number of counts during charge time
fOSC= Oscillator clock frequency (Hz)
NOTE
Noise on the system ground or the external ramping capacitor can cause
the comparator to trip prematurely. Therefore, in any given application it is
best to use the fastest possible ramp rate (shortest charge time).
The previous two equations for the charge time, tCHG, can be combined to form the following expression
for the full scale count (NFS) of the measured time versus the full scale unknown voltage (VFS):
NFS = CEXT x VFS x fOSC / (P x ICHG)
Since a given timing method has a fixed charge current and prescaler, then the variation in the resultant
count for a given unknown voltage is mainly dependent on the operating frequency and the capacitance
value used. The desired external capacitance for a given voltage range, fOSC, conversion method, and
resolution is defined as:
CEXT = NFS x P x ICHG / (VFS x fOSC)
NOTE
The value of any capacitor connected directly to the PB0/AN0 pin should be
limited to less than 2 microfarads. Larger capacitances will create high
discharge currents which may damage the device or create signal noise.
相關(guān)PDF資料
PDF描述
VI-B1H-IY-F4 CONVERTER MOD DC/DC 52V 50W
VE-B43-IX-B1 CONVERTER MOD DC/DC 24V 75W
AD724JRZ-RL IC ENCODER RGB TO NTSC 16SOIC TR
VE-B42-IX-B1 CONVERTER MOD DC/DC 15V 75W
VI-B1F-IY-F3 CONVERTER MOD DC/DC 72V 50W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC705JJ7CDWE 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MC705JP7CPE 功能描述:8位微控制器 -MCU 8B MCU 224 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC705JP7CPE 制造商:Freescale Semiconductor 功能描述:IC 8BIT MCU 68HC05 2.1MHZ DIP-28
MC705K1CP 制造商:Motorola Inc 功能描述:16 PIN DIP INTEGRATED CIRCUIT
MC705L16CFUE 功能描述:8位微控制器 -MCU 8B MCU W/ EPROM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*